How to control Verticillium wilt of cotton

The damage of cotton Verticillium wilt was mainly manifested in the middle and later stages of cotton growth. In July and August, the incidence of Verticillium wilt was light in the years of high temperature, drought and lack of rain in summer. Verticillium wilt is generally not dwarfed, but also can bear a small number of cotton bolls, flower and boll period after a long drought and heavy rain, the leaves suddenly wilted. It looks like a water stain, and then it falls off into a smooth rod. Prevention and control methods: the policy of "prevention first and comprehensive control" should be carried out in the prevention and control of cotton Verticillium wilt. 1. Rotation of cotton and Gramineae crops for 3-4 years. 2. Rational application of nitrogen fertilizer, increased application of organic fertilizer, deep ploughing and careful cultivation to enhance plant disease resistance. 3. Improve the environment of cotton field and eliminate stagnant water. The remains of diseased plants should be burned outside the field at any time and should not be used as fertilizer material. 4 Chemical control: ① was sprayed with 50% carbendazim wettable powder 1000 times or 70% methyl topiramate mixed with humic acid foliar fertilizer to control the development of the disease. For sporadic diseased plants, ② can be irrigated and permeated with 50% cotton wettable powder or 50 times irrigated with 12.5% quick-acting Zhi Wei Ling with water.